Implement restart in vcl_hit.

Fixes #365



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@3386 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_center.c

@@ -543,7 +543,9 @@ cnt_hit(struct sess *sp)
 		sp->step = STP_ERROR;
 		return (0);
 	case VCL_RET_RESTART:
-		INCOMPL();
+		sp->director = NULL;
+		sp->restarts++;
+		sp->step = STP_RECV;
 		return (0);
 	default:
 		WRONG("Illegal action in vcl_hit{}");